I don’t know what more to say about this:

Teachers can’t do fractions.

For all the complex thoughts on teaching approaches and school feeding schemes and  exam difficulty and class sizes and parental involvement and availability of tertiary education and apprenticeships and any number of other issues, if teachers don’t know their subject education is doomed.

If education is doomed our economy will struggle along for decades. If our economy struggles, income inequality and poverty won’t improve. This is not hard.